TI high-efficiency charge pump with I2C interface drives seven white LEDs

July 12, 2007
Date Announced: 12 Jul 2007 -- Tiny, Flexible Converter Supports up to Five LEDs for Main Display and Two LEDs for Sub-Displays DALLAS - Texas Instruments Incorporated (TI) (NYSE: TXN) introduced today a high-efficiency, constant-frequency charge pump DC/DC converter that uses dual-mode conversion to maximize efficiency over the input voltage range. The tiny 3 mm x 3 mm device provides a fully programmable current with I2C interface for applications, such as cellular phones, PDAs and multi-display handheld devices.TI's TPS60250 drives up to five white LEDs for a main display and up to two white LEDs for a sub-display with regulated constant current for uniform intensity. By utilizing adaptive charge pump modes and very low-dropout current regulators, the TPS60250 achieves high efficiency over the full one-cell lithium-battery input voltage range. Four enable inputs, available through I2C, are used for simple on/off controls for the independent displays. To lower operating current when using one sub-display LED, the device providescompletely separate operation in sub-display LEDs.Key Features:* 3-V to 6-V input voltage range * 1x and 1.5x charge pump * Fully programmable current with I2C o 64 dimming steps with 25 mA maximum (sub and main display banks) o 4 dimming steps with 80 mA maximum (DM5 for auxiliary application)* Two percent current matching for sub-LEDs at light load condition(each 100 µA) * 750-kHz charge pump frequency * Continuous 230-mA maximum output current * Auto-switching between 1x and 1.5x mode for maximum efficiency * Built-in soft start and current limit * Open lamp detection * 16-pin, 3 mm x 3 mm QFNPricing and AvailabilityThe TPS60250 is shipping in volume production today from TI and itsworldwide network of distributors and packaged in a 3 mm x 3 mm, 16-pin QFN packaging. Suggested resale price starts at $1.40 in 1,000-unit quantities. Lighting and Display SolutionsTI provides the broadest portfolio of high-performance products fortoday's LED design requirements, along with local support andapplications expertise to help designers get to market faster. TI's LED products include power management, such as AC/DC, power factorcorrection, DC/DC and linear power conversion; RF transceivers; digital signal processors (DSPs); and ultra-low-power microcontrollers (MCUs). TI's products support applications ranging from ultra-small portable displays to the largest lighting and display panels in the industry.

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